University of Oulu

Bergna, D., Romar, H., & Lassi, U. (2018). Physical Activation of Wooden Chips and the Effect of Particle Size, Initial Humidity, and Acetic Acid Extraction on the Properties of Activated Carbons. C, 4(4), 66. doi:10.3390/c4040066

Physical activation of wooden chips and the effect of particle size, initial humidity, and acetic acid extraction on the properties of activated carbons

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Author: Bergna, Davide1,2; Romar, Henrik1,2; Lassi, Ulla1,2
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu
2Unit of Applied Chemistry, Kokkola University Consortium Chydenius-University of Jyvaskyla
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2018
Publish Date: 2019-01-04


In this research study, two different wooden biomasses (birch and pine) were thermally carbonized and steam-activated into activated carbons in a one-stage process. The effects of particle size and humidity (as received and oven-dried) on the properties, such as specific surface areas, pore volumes, and pore size distributions, of the final activated carbon characteristics were examined. Another set of biomasses (birch, spruce, and pine) was pre-treated before carbonization and the activation steps through an extractive process using a weak acetic acid in Soxhlet extractors. According to the results, the dried samples had a slightly lower surface area, while no difference was observed in the yields. For the extracted samples, there was a significant difference, especially in the pore size distributions, compared to the non-extracted samples. There appeared to be a shift from a meso-microporous distribution to a microporous distribution caused by the extractive pre-treatment.

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Series: C. Journal of carbon research
ISSN: 2311-5629
ISSN-E: 2311-5629
ISSN-L: 2311-5629
Volume: 4
Issue: 4
Article number: 66
DOI: 10.3390/c4040066
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: The study was supported by and performed within the project Renepro (20200224) funded by Interreg Nord (H.R.). Economical support was received from the Central Ostrobothnia Cultural Foundation (D.B.).
Copyright information: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (